Jones, who underwent surgery on a dislocated shoulder last weekend, is expected to return to fitness in three months, while Grandison is set to see a specialist to determine whether he needs surgery on his hip.
Mark Wright, who has been sidelined with a hip injury, is expected to miss out again despite being close to a return.
Defender Joe Jacobson scored a rare goal in Tuesday's 1-0 victory over Oldham and is expected to keep his place in the side.
Midfielder Matt Richards and defender James Hurst are pushing for starts.
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